Cheap Flights from St. Louis (SUS) to Phoenix (PHX)

Popular airlines from St. Louis, MO (SUS-Spirit of St. Louis) to Phoenix Sky Harbor Intl. Airport (PHX)

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Frequently asked questions

How much does a flight from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX) cost?
Get a cheap one-way flight or cheap return flight from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX) with Expedia. Enter your travel dates and sort by "Price (lowest to highest)" to find our cheapest flight offers on this route.
What is the cheapest month to fly from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX)?
is the most affordable month to fly from SUS to PHX. Traveling outside of peak seasons is often the key to finding a great deal.
Which airlines fly direct from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX)?
Although St. Louis, MO (SUS-Spirit of St. Louis) doesn't offer any direct flights to Sky Harbor Intl. Airport (PHX), other airports have nonstop options. Departing from Lambert-St. Louis Intl. Airport (STL) will get you to Phoenix without any layovers.
What is the cheapest airline that flies from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX)?
Expedia's filter tool lets you easily compare different airlines, travel time and fares all in one place. Customize the search to your preferences, then sort by "Price (lowest to highest)" to find the carrier with the cheapest SUS to PHX flight.
How many flights per day from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX)?
There are no daily nonstop flights from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX). But you can book flights with layovers. Filter your search results on Expedia to include one or two stops, and you'll be cruising above the clouds before you know it.
What day of the week has the most flights from SUS to PHX?
Generally you'll find the widest variety of flight choices on a Friday. Tuesdays are often the quietest.* However, this can vary depending on the time of year, airline and other factors.*Busiest/quietest day to travel is based on Expedia flight demand through January to December 2024.
What is the best time to fly from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX)?
To land at Sky Harbor Intl. Airport (PHX) on time, book a flight that leaves Spirit of St. Louis Airport (SUS) before 3 PM. The likelihood of cancellations is 22% higher, on average, for departures after this hour.**Most reliable time of the day and month to travel recommendation is based on January through August 2024 flight status data sourced from OAG's global flight data platform.
Is it cheaper to buy a plane ticket from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX) last-minute?
Holding off until just before your departure to book your flight from SUS to PHX often results in higher prices. While you may come across some last-minute deals, they aren't always guaranteed. Keep your travel plans flexible for the best chance of landing a bargain.
Is it cheaper to book a SUS to PHX flight and hotel package?
Securing a SUS to PHX flight and hotel package is typically cheaper than booking separately. With Expedia, you can enjoy the ease of organizing your travels all in one place. Select from our extensive range of stays and then add car rentals, activities and flights to your booking. Bundle everything together, and you could save hundreds of dollars.
Can I cancel or change the date of my flight from Spirit of St. Louis Airport (SUS) to Sky Harbor Intl. Airport (PHX)?
If you reserved your SUS to PHX flight in the last 24 hours, you may be able to modify or cancel it at no cost. Depending on the airline and the type of fare you have, additional charges may apply for changes after that time. Airline policies and contact information can be found in your itinerary or confirmation email. Or, head to our Customer Service portal if you want more information.

Travel information

Origin airport
Spirit of St. Louis
Destination airport
Sky Harbor Intl.
Distance
1243 mi

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St. Louis to Phoenix Flights

The cheapest times to fly from St. Louis to Phoenix

On average, Thursday can be the cheapest time to fly, according to data from the Airlines Reporting Corporation (ARC), one of the world's biggest databases for global airline sales. The data reveals that you could save up to 16% by flying on a Thursday—the cheapest day to travel on average—instead of a Sunday—the most expensive. Some of the most affordable flights from St. Louis to Phoenix are during the month of . You can find some of the cheapest flights from St. Louis to Phoenix with Expedia's search tool and vast selection of airlines.

 

The best time to book a flight from St. Louis to Phoenix

Sunday is one of the best days to book for cheap flights from St. Louis to Phoenix: Tickets reserved on a Sunday cost between 6% and 13% less than those reserved on a Friday, according to ARC data. The data also suggests booking early can also lead to cheaper airfares. You could save 24% by buying your tickets for domestic flights at least a month in advance and 10% by booking international flights 2 months in advance.

 

How to find cheap round-trip tickets from St. Louis to Phoenix

Being flexible with your dates and using Expedia's Price Drop Protection and Price Tracking features are some of the best ways of finding a cheap ticket from St. Louis to Phoenix in 2025. You can also book with separate airlines for your outbound and return journeys, from one-way. Expedia also offers Price Drop Protection, so if the cost of your airfare goes down after booking, you'll receive a credit for the difference*. This is available for a small fee, and is free to One Key Gold and Platinum tier members.

 

Expedia's Price Tracking feature means you can stay on top of airfares without manually checking every day. It sends you automated price alerts for cheap St. Louis to Phoenix flights and uses historical data to indicate when the best time to book is. Download Expedia's free app to activate this handy tool in a few easy taps.

 

You could also save big by booking one of Expedia's vacation packages. Bundling together your St. Louis to Phoenix airfare with your accommodations and car rental is often cheaper than booking everything separately. There’s also One Key, Expedia's generous rewards program. Join for free and you could earn One Key cash on most bookings to save on future adventures.

 

*Terms apply.

 

Disclaimer: ARC The statistics are based on average round-trip ticket prices between January and August 2023. The percentages you see are averages.

 

St. Louis to Phoenix Flights

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